You can use LivePlan for two objects:
(1) Come out with a one time business plan presented to banks/investors in order to secure funding. You can pitch your idea with a simple business plan that fits on one page. Refer How to Write a Business Plan in 30 Minutes.
(2) As an ongoing software tool with features like calculators used together with your accounting software (such as QuickBooks) to come out with an improved business model.